Sanchez's future has been the subject of intense speculation in recent weeks, with United seemingly beating off competition from local rivals and Premier League leaders Manchester City for the 29-year-old's signature.

Official confirmation is yet to arrive from either United or Arsenal, but Sanchez is understood to have completed his medical at United's Carrington training complex earlier today.

The deal, which will also see Henrikh Mkhitaryan move in the opposite direction, is expected to be announced in the next 24 hours, and the first photo of Sanchez in a United shirt has now apparently been released.